The time elapsing between two consecutive passages of a satellite through a characteristic point on its orbit. [NTIA] [RR]

An antenna that has an approximately constant input impedance over a narrow range of frequencies.
Note: An example of a periodic antenna is a dipole array antenna. Synonym resonant antenna.

Processing of various levels of classified and unclassified information at distinctly different times. Under the concept of periods processing, the system must be purged of all information from one processing period before transitioning to the next. Under periods processing, the system must be purged of all information from one processing period before transitioning to the next when there are different… (Read More →)

See peripheral equipment.

In a data processing system, any equipment, distinct from the central processing unit, that may provide the system with additional capabilities.
Note: Such equipment is often offline until needed for a specific purpose and may, in some cases, be shared among several users.

Synonym endpoint node.

An antenna configuration in which the transmitting antenna is oriented to produce a vertical radiation pattern, and a flat or off-axis parabolic reflector, mounted above the transmitting antenna, is used to direct the beam in a horizontal path toward the receiving antenna.
Note: A periscope antenna facilitates increased terrain clearance without long transmission lines, while permitting the active equipment to… (Read More →)

A bond not expected to require disassembly for operational or maintenance purposes.

1. An extended off-hook condition not followed by dialing.
2. A connect signal from the network that has not been followed by network outpulsing within a timed interval. [Tl.405-1989]

A storage device in which stored data are nonerasable.